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annotate src/share/vm/runtime/vmStructs.hpp @ 18096:ca6d25be853b jdk8u25-b13
8044269: Analysis of archive files.
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Reviewed-by: iklam, dholmes, mschoene
| author | jiangli |
|---|---|
| date | Tue, 12 Aug 2014 17:46:16 -0400 |
| parents | 8b46b0196eb0 |
| children | dffc37fa7157 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 7951 | 2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_RUNTIME_VMSTRUCTS_HPP |
| 26 #define SHARE_VM_RUNTIME_VMSTRUCTS_HPP | |
| 27 | |
| 28 #include "utilities/debug.hpp" | |
| 29 #ifdef COMPILER1 | |
| 30 #include "c1/c1_Runtime1.hpp" | |
| 31 #endif | |
| 32 | |
| 0 | 33 // This table encapsulates the debugging information required by the |
| 34 // serviceability agent in order to run. Specifically, we need to | |
| 35 // understand the layout of certain C data structures (offsets, in | |
| 36 // bytes, of their fields.) | |
| 37 // | |
| 38 // There are alternatives for the design of this mechanism, including | |
| 39 // parsing platform-specific debugging symbols from a debug build into | |
| 40 // a program database. While this current mechanism can be considered | |
| 41 // to be a workaround for the inability to debug arbitrary C and C++ | |
| 42 // programs at the present time, it does have certain advantages. | |
| 43 // First, it is platform-independent, which will vastly simplify the | |
| 44 // initial bringup of the system both now and on future platforms. | |
| 45 // Second, it is embedded within the VM, as opposed to being in a | |
| 46 // separate program database; experience has shown that whenever | |
| 47 // portions of a system are decoupled, version skew is problematic. | |
| 48 // Third, generating a program database, for example for a product | |
| 49 // build, would probably require two builds to be done: the desired | |
| 50 // product build as well as an intermediary build with the PRODUCT | |
| 51 // flag turned on but also compiled with -g, leading to a doubling of | |
| 52 // the time required to get a serviceability agent-debuggable product | |
| 53 // build. Fourth, and very significantly, this table probably | |
| 54 // preserves more information about field types than stabs do; for | |
| 55 // example, it preserves the fact that a field is a "jlong" rather | |
| 56 // than transforming the type according to the typedef in jni_md.h, | |
| 57 // which allows the Java-side code to identify "Java-sized" fields in | |
| 58 // C++ data structures. If the symbol parsing mechanism was redone | |
| 59 // using stabs, it might still be necessary to have a table somewhere | |
| 60 // containing this information. | |
| 61 // | |
| 62 // Do not change the sizes or signedness of the integer values in | |
| 63 // these data structures; they are fixed over in the serviceability | |
| 64 // agent's Java code (for bootstrapping). | |
| 65 | |
| 66 typedef struct { | |
| 67 const char* typeName; // The type name containing the given field (example: "Klass") | |
| 68 const char* fieldName; // The field name within the type (example: "_name") | |
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69 const char* typeString; // Quoted name of the type of this field (example: "Symbol*"; |
| 0 | 70 // parsed in Java to ensure type correctness |
| 71 int32_t isStatic; // Indicates whether following field is an offset or an address | |
| 72 uint64_t offset; // Offset of field within structure; only used for nonstatic fields | |
| 73 void* address; // Address of field; only used for static fields | |
| 74 // ("offset" can not be reused because of apparent SparcWorks compiler bug | |
| 75 // in generation of initializer data) | |
| 76 } VMStructEntry; | |
| 77 | |
| 78 typedef struct { | |
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79 const char* typeName; // Type name (example: "Method") |
| 0 | 80 const char* superclassName; // Superclass name, or null if none (example: "oopDesc") |
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81 int32_t isOopType; // Does this type represent an oop typedef? (i.e., "Method*" or |
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82 // "Klass*", but NOT "Method") |
| 0 | 83 int32_t isIntegerType; // Does this type represent an integer type (of arbitrary size)? |
| 84 int32_t isUnsigned; // If so, is it unsigned? | |
| 85 uint64_t size; // Size, in bytes, of the type | |
| 86 } VMTypeEntry; | |
| 87 | |
| 88 typedef struct { | |
| 89 const char* name; // Name of constant (example: "_thread_in_native") | |
| 90 int32_t value; // Value of constant | |
| 91 } VMIntConstantEntry; | |
| 92 | |
| 93 typedef struct { | |
| 94 const char* name; // Name of constant (example: "_thread_in_native") | |
| 95 uint64_t value; // Value of constant | |
| 96 } VMLongConstantEntry; | |
| 97 | |
| 98 // This class is a friend of most classes, to be able to access | |
| 99 // private fields | |
| 100 class VMStructs { | |
| 101 public: | |
| 102 // The last entry is identified over in the serviceability agent by | |
| 103 // the fact that it has a NULL fieldName | |
| 104 static VMStructEntry localHotSpotVMStructs[]; | |
| 105 | |
| 106 // The last entry is identified over in the serviceability agent by | |
| 107 // the fact that it has a NULL typeName | |
| 108 static VMTypeEntry localHotSpotVMTypes[]; | |
| 109 | |
| 110 // Table of integer constants required by the serviceability agent. | |
| 111 // The last entry is identified over in the serviceability agent by | |
| 112 // the fact that it has a NULL typeName | |
| 113 static VMIntConstantEntry localHotSpotVMIntConstants[]; | |
| 114 | |
| 115 // Table of long constants required by the serviceability agent. | |
| 116 // The last entry is identified over in the serviceability agent by | |
| 117 // the fact that it has a NULL typeName | |
| 118 static VMLongConstantEntry localHotSpotVMLongConstants[]; | |
| 119 | |
| 120 // This is used to run any checking code necessary for validation of | |
| 121 // the data structure (debug build only) | |
| 122 static void init(); | |
| 123 | |
| 7171 | 124 #ifndef PRODUCT |
| 125 // Execute unit tests | |
| 126 static void test(); | |
| 127 #endif | |
| 128 | |
| 0 | 129 private: |
| 130 // Look up a type in localHotSpotVMTypes using strcmp() (debug build only). | |
| 131 // Returns 1 if found, 0 if not. | |
| 132 // debug_only(static int findType(const char* typeName);) | |
| 133 static int findType(const char* typeName); | |
| 134 }; | |
| 1972 | 135 |
| 136 #endif // SHARE_VM_RUNTIME_VMSTRUCTS_HPP |